Faculty Profiles - SHIMIZU Hirohiko

Development of ultracold neutron accelerator for time focusing of pulsed neutrons Open Access

Imajo S., Iwashita Y., Kitaguchi M., Shimizu H.M., Mishima K., Ino T., Yamashita S.

Proceedings of the 28th Linear Accelerator Conference, LINAC 2016 page： 56 - 58 2016

Publisher：Proceedings of the 28th Linear Accelerator Conference, LINAC 2016

Low energy neutron accelerator can be realized by the combination of an adiabatic fast passage spin flipper and a gradient magnetic field. Neutrons have magnetic moments, so that the accumulated potential energies are not canceled before and after passage of a magnetic field and their kinetic energies change in case their spins are flipped in the field. This accelerator handles lower kinetic energy neutrons than approximately 300 neV. Currently we have developed the advanced version which makes it possible to handle broader kinetic energy range. The design and measured characteristics are described.

DOI： 10.18429/JACoW-LINAC2016-MOOP07

Discrete symmetry tests in neutron-induced compound states Open Access

Shimizu H.M., Snow W.M., Gudkov V.P., Bowman J.D., Curole J., Goodson B.M., Harada H., Hautle P., Hino M., Hirota K., Ichikawa G., Ino T., Ishimoto S., Iwata T., Kimura A., Kitaguchi M., Kiyanagi Y., Koga J., Mishima K., Miyachi Y., Momose T., Morishima T., Nagamoto K., Okada A., Okudaira T., Penttila S., Plaster B., Sakai K., Schaper D., Takada S., Taketani K., Tong X., Tremsin A.S., Yamagata Y., Yamamoto T., Yamanaka N., Yokohashi M., Yoshioka T.

Proceedings of Science Vol. 2016-September 2016

Measurement of angular correlations in the (n, γ) reaction for T Violation Search Open Access

Okudaira T., Shimizu H.M., Kitaguchi M., Hirota K., Takada S., Yamamoto T., Okada A., Yoshioka T., Ino T., Sakai K., Asahi K., Momose T., Iwata T., Hino M., Shima T., Yamagata Y.

Proceedings of Science Vol. 2016-September 2016

Publisher：Proceedings of Science

Large enhanced P-violations was discovered in several compound nuclei. A mechanism of P-violation can be applied to enhancement of T-violation in compound nucleus. We plan the experiment for sensitive T-violation search, however, the mechanism of P-violation(s-p mixing) has not been verified in detail yet and the spin factor K(J) has not been measured in candidate nuclei for T-violation search. We need to measure angular distributions in the (n, y) reaction for verification of s-p mixing and determination of K(J) as a feasibility study for the T-violation search. The (n,γ) reaction of 139La which is one of the candidate nuclei was measured with 4π germanium spectrometer in J-PARC/MLF/ANNRI. A neutron spectrum and a γ-ray spectrum for 139La was obtained.

DOI： 10.22323/1.281.0188

Precise neutron lifetime experiment using pulsed neutron beams at J-PARC Open Access

Nagakura N., Hirota K., Ieki S., Ino T., Iwashita Y., Kitaguchi M., Kitahara R., Mishima K., Morishita A., Oide H., Otono H., Sakakibara R., Seki Y., Shima T., Shimizu H.M., Sugino T., Sumi N., Sumino H., Taketani K., Tanaka G., Tomita T., Yamada T., Yamashita S., Yokohashi M., Yoshioka T.

Proceedings of Science Vol. 2016-September 2016

Publisher：Proceedings of Science

The neutron lifetime (τn) is one of the basic parameters in the weak interaction, and is used for predicting the light element abundance in the early universe. Our group developed a new setup to measure τn with the goal precision of 0.1% at the polarized beam branch BL05 of MLF, J-PARC. The commissioning data was acquired in 2014 and 2015, and the first set of data to evaluate τn in 2016, which is expected to yield a statistical uncertainty of O(1)%. This paper presents the current analysis results and the future plans to achieve our goal precision.

DOI： 10.22323/1.281.0191

Measurement of neutron scattering from noble gas to search for a short-range unknown force Open Access

Oi N., Shimizu H.M., Hirota K., Kitaguchi M., Haddock C.C., Snow W.M., Yoshioka T., Matsumoto S., Mishima K., Ino T., Shima T.

Proceedings of Science Vol. 2016-September 2016

Publisher：Proceedings of Science

We are searching for an unknown force that could couple to mass using neutron scattering from a noble gas. The neutron is a chargeless massive particle with a long lifetime, which consequently is suitable for the precision measurement of a small interaction with a range of the order of 1nm by measurements of the momentum transfer distribution. We measured neutron scattering at the low-divergence beam branch on the BL05 NOP beamline in the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC). We measured 105 scattering events and report our most recent analysis.

DOI： 10.22323/1.294.0050

Feasibility study of neutron wavelength compressor for edm measurement Open Access

Kitaguchi M., Iwashita Y., Shimizu H.

Proceedings of Science Vol. 2016-September 2016

Publisher：Proceedings of Science

Neutrons can be accelerate and/or decelerate by using spin flip in the magnetic field. Controlling the number of spin-flips in the series of flippers enables us to change the energy of the acceleration/deceleration. The distribution of velocity of these neutrons can be concentrated by accelerating properly in the middle of the transport. The width of wavelength of the neutrons is compressed to improve the production of ultra-cold neutrons by superthermal method by using superfluid He-II. This has the advantage to improve the sensitivity of neutron EDM search.

DOI： 10.22323/1.281.0180

Development of time projection chamber for precise neutron lifetime measurement using pulsed cold neutron beams Open Access

Arimoto, Y; Higashi, N; Igarashi, Y; Iwashita, Y; Ino, T; Katayama, R; Kitaguchi, M; Kitahara, R; Matsumura, H; Mishima, K; Nagakura, N; Oide, H; Otono, H; Sakakibara, R; Shima, T; Shimizu, HM; Sugino, T; Sumi, N; Sumino, H; Taketani, K; Tanaka, G; Tanaka, M; Tauchi, K; Toyoda, A; Tomita, T; Yamada, T; Yamashita, S; Yokoyama, H; Yoshioka, T

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 799 page： 187 - 196 2015.11

Publisher：Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

A new time projection chamber (TPC) was developed for neutron lifetime measurement using a pulsed cold neutron spallation source at the Japan Proton Accelerator Research Complex (J-PARC). Managing considerable background events from natural sources and the beam radioactivity is a challenging aspect of this measurement. To overcome this problem, the developed TPC has unprecedented features such as the use of polyether-ether-ketone plates in the support structure and internal surfaces covered with <sup>6</sup>Li-enriched tiles to absorb outlier neutrons. In this paper, the design and performance of the new TPC are reported in detail.

DOI： 10.1016/j.nima.2015.08.006

Performances of JEM-EUSO: angular reconstruction: The JEM-EUSO Collaboration Open Access

Adams J.H., Ahmad S., Albert J.N., Allard D., Anchordoqui L., Andreev V., Anzalone A., Arai Y., Asano K., Ave Pernas M., Baragatti P., Barrillon P., Batsch T., Bayer J., Bechini R., Belenguer T., Bellotti R., Belov K., Berlind A.A., Bertaina M., Biermann P.L., Biktemerova S., Blaksley C., Blanc N., Błȩcki J., Blin-Bondil S., Blümer J., Bobik P., Bogomilov M., Bonamente M., Briggs M.S., Briz S., Bruno A., Cafagna F., Campana D., Capdevielle J.N., Caruso R., Casolino M., Cassardo C., Castellinic G., Catalano C., Catalano G., Cellino A., Chikawa M., Christl M.J., Cline D., Connaughton V., Conti L., Cordero G., Crawford H.J., Cremonini R., Csorna S., Dagoret-Campagne S., de Castro A.J., De Donato C., de la Taille C., De Santis C., del Peral L., Dell’Oro A., De Simone N., Di Martino M., Distratis G., Dulucq F., Dupieux M., Ebersoldt A., Ebisuzaki T., Engel R., Falk S., Fang K., Fenu F., Fernández-Gómez I., Ferrarese S., Finco D., Flamini M., Fornaro C., Franceschi A., Fujimoto J., Fukushima M., Galeotti P., Garipov G., Geary J., Gelmini G., Giraudo G., Gonchar M., González Alvarado C., Gorodetzky P., Guarino F., Guzmán A., Hachisu Y., Harlov B., Haungs A., Hernández Carretero J., Higashide K., Ikeda D., Ikeda H., Inoue N., Inoue S., Insolia A., Isgrò F.

Experimental Astronomy Vol. 40 ( 1 ) page： 153 - 177 2015.11

Publisher：Experimental Astronomy

Mounted on the International Space Station(ISS), the Extreme Universe Space Observatory, on-board the Japanese Experimental Module (JEM-EUSO), relies on the well established fluorescence technique to observe Extensive Air Showers (EAS) developing in the earth’s atmosphere. Focusing on the detection of Ultra High Energy Cosmic Rays (UHECR) in the decade of 1020eV, JEM-EUSO will face new challenges by applying this technique from space. The EUSO Simulation and Analysis Framework (ESAF) has been developed in this context to provide a full end-to-end simulation frame, and assess the overall performance of the detector. Within ESAF, angular reconstruction can be separated into two conceptually different steps. The first step is pattern recognition, or filtering, of the signal to separate it from the background. The second step is to perform different types of fitting in order to search for the relevant geometrical parameters that best describe the previously selected signal. In this paper, we discuss some of the techniques we have implemented in ESAF to perform the geometrical reconstruction of EAS seen by JEM-EUSO. We also conduct thorough tests to assess the performances of these techniques in conditions which are relevant to the scope of the JEM-EUSO mission. We conclude by showing the expected angular resolution in the energy range that JEM-EUSO is expected to observe.

DOI： 10.1007/s10686-013-9371-0

Calibration aspects of the JEM-EUSO mission

Adams, JH Jr; Ahmad, S; Albert, JN; Allard, D; Anchordoqui, L; Andreev, V; Anzalone, A; Arai, Y; Asano, K; Pernas, MA; Baragatti, P; Barrillon, P; Batsch, T; Bayer, J; Bechini, R; Belenguer, T; Bellotti, R; Belov, K; Berlind, AA; Bertaina, M; Biermann, PL; Biktemerova, S; Blaksley, C; Blanc, N; Blecki, J; Blin-Bondil, S; Blümer, J; Bobik, P; Bogomilov, M; Bonamente, M; Briggs, MS; Briz, S; Bruno, A; Cafagna, F; Campana, D; Capdevielle, JN; Caruso, R; Casolino, M; Cassardo, C; Castellini, G; Catalano, C; Catalano, O; Cellino, A; Chikawa, M; Christl, MJ; Cline, D; Connaughton, V; Conti, L; Cordero, G; Crawford, HJ; Cremonini, R; Csorna, S; Dagoret-Campagne, S; de Castro, AJ; de Donato, C; de la Taille, C; de Santis, C; del Peral, L; Dell'Oro, A; De Simone, N; Di Martino, M; Distratis, G; Dulucq, F; Dupieux, M; Ebersoldt, A; Ebisuzaki, T; Engel, R; Falk, S; Fang, K; Fenu, F; Fernández-Gómez, I; Ferrarese, S; Finco, D; Flamini, M; Fornaro, C; Franceschi, A; Fujimoto, J; Fukushima, M; Galeotti, P; Garipov, G; Geary, J; Gelmini, G; Giraudo, G; Gonchar, M; Alvarado, CG; Gorodetzky, P; Guarino, F; Guzmán, A; Hachisu, Y; Harlov, B; Haungs, A; Carretero, JH; Higashide, K; Ikeda, D; Ikeda, H; Inoue, N; Inoue, S; Insolia, A; Isgrò, F; Itow, Y; Joven, E; Judd, EG; Jung, A; Kajino, F; Kajino, T; Kaneko, I; Karadzhov, Y; Karczmarczyk, J; Karus, M; Katahira, K; Kawai, K; Kawasaki, Y; Keilhauer, B; Khrenov, BA; Kim, JS; Kim, SW; Kim, SW; Kleifges, M; Klimov, PA; Kolev, D; Kreykenbohm, I; Kudela, K; Kurihara, Y; Kusenko, A; Kuznetsov, E; Lacombe, M; Lachaud, C; Lee, J; Licandro, J; Lim, H; López, F; Maccarone, MC; Mannheim, K; Maravilla, D; Marcelli, L; Marini, A; Martinez, O; Masciantonio, G; Mase, K; Matev, R; Medina-Tanco, G; Mernik, T; Miyamoto, H; Miyazaki, Y; Mizumoto, Y; Modestino, G; Monaco, A; Monnier-Ragaigne, D; de los Ríos, JAM; Moretto, C; Morozenko, VS; Mot, B; Murakami, T; Nagano, M; Nagata, M; Nagataki, S; Nakamura, T; Napolitano, T; Naumov, D; Nava, R; Neronov, A; Nomoto, K; Nonaka, T; Ogawa, T; Ogio, S; Ohmori, H; Olinto, AV; Orleanski, P; Osteria, G; Panasyuk, MI; Parizot, E; Park, IH; Park, HW; Pastircak, B; Patzak, T; Paul, T; Pennypacker, C; Cano, SP; Peter, T; Picozza, P; Pierog, T; Piotrowski, LW; Piraino, S; Plebaniak, Z; Pollini, A; Prat, P; Prévôt, G; Pierog, T; Piotrowski, LW; Piraino, S; Plebaniak, Z; Pollini, A; Prat, P; Prévôt, G; Prieto, H; Putis, M; Reardon, P; Reyes, M; Ricci, M; Rodriguez, I; Rodríguez, MD; Frías, MDR; Ronga, F; Roth, M; Rothkaehl, H; Roudil, G; Rusinov, I; Rybczynski, M; Sabau, MD; Cano, GS; Sagawa, H; Saito, A; Sakaki, N; Sakata, M; Salazar, H; Sánchez, S; Santangelo, A; Cruz, LS; Palomino, MS; Saprykin, O; Sarazin, F; Sato, H; Sato, M; Schanz, T; Schieler, H; Scotti, V; Segreto, A; Selmane, S; Semikoz, D; Serra, M; Sharakin, S; Shibata, T; Shimizu, HM; Shinozaki, K; Shirahama, T; Siemieniec-Ozieblo, G; López, HHS; Sledd, J; Slominska, K; Sobey, A; Sugiyama, T; Supanitsky, D; Suzuki, M; Szabelska, B; Szabelski, J; Tajima, F; Tajima, N; Tajima, T; Takahashi, Y; Takami, H; Takeda, M; Takizawa, Y; Tenzer, C; Tibolla, O; Tkachev, L; Tokuno, H; Tomida, T; Tone, N; Toscano, S; Trillaud, F; Tsenov, R; Tsunesada, Y; Tsuno, K; Tymieniecka, T; Uchihori, Y; Unger, M; Vaduvescu, O; Valdés-Galicia, JF; Vallania, P; Valore, L; Vankova, G; Vigorito, C; Villaseñor, L; von Ballmoos, P; Wada, S; Watanabe, J; Watanabe, S; Watts, J ; Weber, M; Weiler, TJ; Wibig, T; Wiencke, L; Wille, M; Wilms, J; Wlodarczyk, Z; Yamamoto, T; Yamamoto, Y; Yang, J; Yano, H; Yashin, IV; Yonetoku, D; Yoshida, K; Yoshida, S; Young, R; Zotov, MY; Marchi, AZ

EXPERIMENTAL ASTRONOMY Vol. 40 ( 1 ) page： 91 - 116 2015.11

Publisher：Experimental Astronomy

The JEM-EUSO telescope will be, after calibration, a very accurate instrument which yields the number of received photons from the number of measured photo-electrons. The project is in phase A (demonstration of the concept) including already operating prototype instruments, i.e. many parts of the instrument have been constructed and tested. Calibration is a crucial part of the instrument and its use. The focal surface (FS) of the JEM-EUSO telescope will consist of about 5000 photo-multiplier tubes (PMTs), which have to be well calibrated to reach the required accuracy in reconstructing the air-shower parameters. The optics system consists of 3 plastic Fresnel (double-sided) lenses of 2.5 m diameter. The aim of the calibration system is to measure the efficiencies (transmittances) of the optics and absolute efficiencies of the entire focal surface detector. The system consists of 3 main components: (i) Pre-flight calibration devices on ground, where the efficiency and gain of the PMTs will be measured absolutely and also the transmittance of the optics will be. (ii) On-board relative calibration system applying two methods: a) operating during the day when the JEM-EUSO lid will be closed with small light sources on board. b) operating during the night, together with data taking: the monitoring of the background rate over identical sites. (iii) Absolute in-flight calibration, again, applying two methods: a) measurement of the moon light, reflected on high altitude, high albedo clouds. b) measurements of calibrated flashes and tracks produced by the Global Light System (GLS). Some details of each calibration method will be described in this paper.

DOI： 10.1007/s10686-015-9453-2

The JEM-EUSO observation in cloudy conditions

Adams, JH Jr; Ahmad, S; Albert, JN; Allard, D; Anchordoqui, L; Andreev, V; Anzalone, A; Arai, Y; Asano, K; Pernas, MA; Baragatti, P; Barrillon, P; Batsch, T; Bayer, J; Bechini, R; Belenguer, T; Bellotti, R; Belov, K; Berlind, AA; Bertaina, M; Biermann, PL; Biktemerova, S; Blaksley, C; Blanc, N; Blecki, J; Blin-Bondil, S; Blümer, J; Bobik, P; Bogomilov, M; Bonamente, M; Briggs, MS; Briz, S; Bruno, A; Cafagna, F; Campana, D; Capdevielle, JN; Caruso, R; Casolino, M; Cassardo, C; Castellini, G; Catalano, C; Catalano, O; Cellino, A; Chikawa, M; Christl, MJ; Cline, D; Connaughton, V; Conti, L; Cordero, G; Crawford, HJ; Cremonini, R; Csorna, S; Dagoret-Campagne, S; de Castro, AJ; De Donato, C; de la Taille, C; De Santis, C; del Peral, L; Dell'Oro, A; De Simone, N; Di Martino, M; Distratis, G; Dulucq, F; Dupieux, M; Ebersoldt, A; Ebisuzaki, T; Engel, R; Falk, S; Fang, K; Fenu, F; Fernández-Gómez, I; Ferrarese, S; Finco, D; Flamini, M; Fornarodo, C; Franceschi, A; Fujimoto, J; Fukushima, M; Galeotti, P; Garipov, G; Geary, J; Gelmini, G; Giraudo, G; Gonchar, M; Alvarado, CG; Gorodetzky, P; Guarino, F; Guzmán, A; Hachisu, Y; Harlov, B; Haungs, A; Carretero, JH; Higashide, K; Ikeda, D; Ikeda, H; Inoue, N; Inoue, S; Insolia, A; Isgrò, F; Itow, Y; Joven, E; Judd, EG; Jung, A; Kajino, F; Kajino, T; Kaneko, I; Karadzhov, Y; Karczmarczyk, J; Karus, M; Katahira, K; Kawai, K; Kawasaki, Y; Keilhauer, B; Khrenov, BA; Kim, JS; Kim, SW; Kim, SW; Kleifges, M; Klimov, PA; Kolev, D; Kreykenbohm, I; Kudela, K; Kurihara, Y; Kusenko, A; Kuznetsov, E; Lacombe, M; Lachaud, C; Lee, J; Licandro, J; Lim, H; López, F; Maccarone, MC; Mannheim, K; Maravilla, D; Marcelli, L; Marini, A; Martinez, O; Masciantonio, G; Mase, K; Matev, R; Medina-Tanco, G; Mernik, T; Miyamoto, H; Miyazaki, Y; Mizumoto, Y; Modestino, G; Monaco, A; Monnier-Ragaigne, D; de los Ríos, JAM; Moretto, C; Morozenko, VS; Mot, B; Murakami, T; Nagano, M; Nagata, M; Nagataki, S; Nakamura, T; Napolitano, T; Naumov, D; Nava, R; Neronov, A; Nomoto, K; Nonaka, T; Ogawa, T; Ogio, S; Ohmori, H; Olinto, AV; Orleanski, P; Osteria, G; Panasyuk, MI; Parizot, E; Park, IH; Park, HW; Pastircakja, B; Patzak, T; Paul, T; Pennypacker, C; Cano, SP; Peter, T; Picozza, P; Pierog, T; Piotrowski, LW; Piraino, S; Plebaniak, Z; Pollini, A; Prat, P; Prévôt, G; Prieto, H; Putis, M; Reardon, P; Reyes, M; Ricci, M; Rodríguez, I; Frías, MDR; Ronga, F; Roth, M; Rothkaehl, H; Roudil, G; Rusinov, I; Rybczynski, M; Sabau, MD; Cano, GS; Sagawa, H; Saito, A; Sakaki, N; Sakata, M; Salazar, H; Sánchez, S; Santangelo, A; Crúz, LS; Palomino, MS; Saprykin, O; Sarazin, F; Sato, H; Sato, M; Schanz, T; Schieler, H; Scotti, V; Segreto, A; Selmane, S; Semikoz, D; Serra, M; Sharakin, S; Shibata, T; Shimizu, HM; Shinozaki, K; Shirahama, T; Siemieniec-Ozieblo, G; López, HHS; Sledd, J; Slominska, K; Sobey, A; Sugiyama, T; Supanitsky, D; Suzuki, M; Szabelska, B; Szabelski, J; Tajima, F; Tajima, N; Tajima, T; Takahashi, Y; Takami, H; Takeda, M; Takizawa, Y; Tenzer, C; Tibolla, O; Tkachev, L; Tokuno, H; Tomida, T; Tone, N; Toscano, S; Trillaud, F; Tsenov, R; Tsunesada, Y; Tsuno, K; Tymieniecka, T; Uchihori, Y; Unger, M; Vaduvescu, O; Valdés-Galicia, JF; Vallania, P; Valore, L; Vankova, G; Vigorito, C; Villaseñor, L; von Ballmoos, P; Wada, S; Watanabe, J; Watanabe, S; Watts, J ; Weber, M; Weiler, TJ; Wibig, T; Wiencke, L; Wille, M; Wilms, J; Wlodarczyk, Z; Yamamoto, T; Yamamoto, Y; Yang, J; Yano, H; Yashin, IV; Yonetoku, D; Yoshida, K; Yoshida, S; Young, R; Zotov, MY; Marchi, AZ

EXPERIMENTAL ASTRONOMY Vol. 40 ( 1 ) page： 135 - 152 2015.11

Publisher：Experimental Astronomy

The JEM-EUSO (Extreme Universe Space Observatory on-board the Japanese Experiment Module) mission will conduct extensive air shower (EAS) observations on the International Space Station (ISS). Following the ISS orbit, JEM-EUSO will experience continuous changes in the atmospheric conditions, including cloud presence. The influence of clouds on space-based observation is, therefore, an important topic to investigate from both EAS property and cloud climatology points of view. In the present work, the impact of clouds on the apparent profile of EAS is demonstrated through the simulation studies, taking into account the JEM-EUSO instrument and properties of the clouds. These results show a dependence on the cloud-top altitude and optical depth of the cloud. The analyses of satellite measurements on the cloud distribution indicate that more than 60 % of the cases allow for conventional EAS observation, and an additional ∼20 % with reduced quality. The combination of the relevant factors results in an effective trigger aperture of EAS observation ∼72 %, compared to the one in the clear atmosphere condition.

DOI： 10.1007/s10686-014-9377-2

The JEM-EUSO mission: An introduction Open Access

Adams, JH Jr; Ahmad, S; Albert, JN; Allard, D; Anchordoqui, L; Andreev, V; Anzalone, A; Arai, Y; Asano, K; Pernas, MA; Baragatti, P; Barrillon, P; Batsch, T; Bayer, J; Bechini, R; Belenguer, T; Bellotti, R; Belov, K; Berlind, AA; Bertaina, M; Biermann, PL; Biktemerova, S; Blaksley, C; Blanc, N; Blecki, J; Blin-Bondil, S; Blümer, J; Bobik, P; Bogomilov, M; Bonamente, M; Briggs, MS; Briz, S; Bruno, A; Cafagna, F; Campana, D; Capdevielle, JN; Caruso, R; Casolino, M; Cassardo, C; Castellini, G; Catalano, C; Catalano, O; Cellino, A; Chikawa, M; Christl, MJ; Cline, D; Connaughton, V; Conti, L; Cordero, G; Crawford, HJ; Cremonini, R; Csorna, S; Dagoret-Campagne, S; de Castro, AJ; de Donato, C; de la Taille, C; Santis, C; del Peral, L; Dell'Oro, A; De Simone, N; Di Martino, M; Distratis, G; Dulucq, F; Dupieux, M; Ebersoldt, A; Ebisuzaki, T; Engel, R; Falk, S; Fang, K; Fenu, F; Fernández-Gómez, I; Ferrarese, S; Finco, D; Flamini, M; Fornaro, C; Franceschi, A; Fujimoto, J; Fukushima, M; Galeotti, P; Garipov, G; Geary, J; Gelmini, G; Giraudo, G; Gonchar, M; Alvarado, CG; Gorodetzky, P; Guarino, F; Guzmán, A; Hachisu, Y; Harlov, B; Haungs, A; Carretero, JH; Higashide, K; Ikeda, D; Ikeda, H; Inoue, N; Inoue, S; Insolia, A; Isgrò, F; Itow, Y; Joven, E; Judd, EG; Jung, A; Kajino, F; Kajino, T; Kaneko, I; Karadzhov, Y; Karczmarczyk, J; Karus, M; Katahira, K; Kawai, K; Kawasaki, Y; Keilhauer, B; Khrenov, BA; Kim, JS; Kim, SW; Kim, SW; Kleifges, M; Klimov, PA; Kolev, D; Kreykenbohm, I; Kudela, K; Kurihara, Y; Kusenko, A; Kuznetsov, E; Lacombe, M; Lachaud, C; Lee, J; Licandro, J; Lim, H; López, F; Maccarone, MC; Mannheim, K; Maravilla, D; Marcelli, L; Marini, A; Martinez, O; Masciantonio, G; Mase, K; Matev, R; Medina-Tanco, G; Mernik, T; Miyamoto, H; Miyazaki, Y; Mizumoto, Y; Modestino, G; Monaco, A; Monnier-Ragaigne, D; Ríos, JAMD; Moretto, C; Morozenko, VS; Mot, B; Murakami, T; Nagano, M; Nagata, M; Nagataki, S; Nakamura, T; Napolitano, T; Naumov, D; Nava, R; Neronov, A; Nomoto, K; Nonaka, T; Ogawa, T; Ogio, S; Ohmori, H; Olinto, AV; Orleanski, P; Osteria, G; Panasyuk, MI; Parizot, E; Park, IH; Park, HW; Pastircak, B; Patzak, T; Paul, T; Pennypacker, C; Cano, SP; Peter, T; Picozza, P; Pierog, T; Piotrowski, LW; Piraino, S; Plebaniak, Z; Pollini, A; Prat, P; Prévôt, G; Prieto, H; Putis, M; Reardon, P; Reyes, M; Ricci, M; Rodríguez, I; Frías, MDR; Ronga, F; Roth, M; Rothkaehl, H; Roudil, G; Rusinov, I; Rybczynski, M; Sabau, MD; Cano, GS; Sagawa, H; Saito, A; Sakaki, N; Sakata, M; Salazar, H; Sánchez, S; Santangelo, A; Crúz, LS; Palomino, MS; Saprykin, O; Sarazin, F; Sato, H; Sato, M; Schanz, T; Schieler, H; Scotti, V; Segreto, A; Selmane, S; Semikoz, D; Serra, M; Sharakin, S; Shibata, T; Shimizu, HM; Shinozaki, K; Shirahama, T; Siemieniec-Ozieblo, G; López, HHS; Sledd, J; Slominska, K; Sobey, A; Sugiyama, T; Supanitsky, D; Suzuki, M; Szabelska, B; Szabelski, J; Tajima, F; Tajima, N; Tajima, T; Takahashi, Y; Takami, H; Takeda, M; Takizawa, Y; Tenzer, C; Tibolla, O; Tkachev, L; Tokuno, H; Tomida, T; Tone, N; Toscano, S; Trillaud, F; Tsenov, R; Tsunesada, Y; Tsuno, K; Tymieniecka, T; Uchihori, Y; Unger, M; Vaduvescu, O; Valdés-Galicia, JF; Vallania, P; Valore, L; Vankova, G; Vigorito, C; Villaseñor, L; von Ballmoos, P; Wada, S; Watanabe, J; Watanabe, S; Watts, J ; Weber, M; Weiler, TJ; Wibig, T; Wiencke, L; Wille, M; Wilms, J; Wlodarczyk, Z; Yamamoto, T; Yamamoto, Y; Yang, J; Yano, H; Yashin, IV; Yonetoku, D; Yoshida, K; Yoshida, S; Young, R; Zotov, MY; Marchi, AZ

EXPERIMENTAL ASTRONOMY Vol. 40 ( 1 ) page： 3 - 17 2015.11

Publisher：Experimental Astronomy

The Extreme Universe Space Observatory on board the Japanese Experiment Module of the International Space Station, JEM-EUSO, is being designed to search from space ultra-high energy cosmic rays. These are charged particles with energies from a few 1019 eV to beyond 1020 eV, at the very end of the known cosmic ray energy spectrum. JEM-EUSO will also search for extreme energy neutrinos, photons, and exotic particles, providing a unique opportunity to explore largely unknown phenomena in our Universe. The mission, principally based on a wide field of view (60 degrees) near-UV telescope with a diameter of ∼ 2.5 m, will monitor the earth’s atmosphere at night, pioneering the observation from space of the ultraviolet tracks (290-430 nm) associated with giant extensive air showers produced by ultra-high energy primaries propagating in the earth’s atmosphere. Observing from an orbital altitude of ∼ 400 km, the mission is expected to reach an instantaneous geometrical aperture of Ageo ≥ 2 × 105 km2 sr with an estimated duty cycle of ∼ 20 %. Such a geometrical aperture allows unprecedented exposures, significantly larger than can be obtained with ground-based experiments. In this paper we briefly review the history of space-based search for ultra-high energy cosmic rays. We then introduce the special issue of Experimental Astronomy devoted to the various aspects of such a challenging enterprise. We also summarise the activities of the on-going JEM-EUSO program.

DOI： 10.1007/s10686-015-9482-x